Distorted picris

Distorted picris

Observation - Distorted picris - UK and Ireland. Description: Found on the boundary of agricultural land, just beyond the fence. Weirdly distorted, fattened and flattened main stem. No other similar ones found. Leaves appear to be Picris hieracioides, but the stem is very strange. Would pesticides cause this?

Found on the boundary of agricultural land, just beyond the fence. Weirdly distorted, fattened and flattened main stem. No other similar ones found.

Leaves appear to be Picris hieracioides, but the stem is very strange.

Would pesticides cause this? Any suggestions welcome.